Blight/Harvest Hybrid Endgame Mechanic Idea

I think having Blight and Harvest being combined into one endgame mechanic could be an incredible idea.
The Grove arena from the Oshabi boss fight could serve as a reimagined Blighted map where the tree roots would be Blight mycelia and the three Harvest bosses pre-Oshabi could be Blighted and serve as the new Blight bosses, and at the end of the fight you could fight a reborn and blighted Oshabi as the final boss fight.
The oils could be the three lifeforces, and Horticrafting could be reintroduced as a way to change elemental modifiers to a different modifier of the same type and tier, with a different random other element, thus expanding crafting.

Additionally: I just thought of another crafting mechanic that could be added to this, while you get one of the three lifeforces from Blight itself, when defeating Oshabi she drops Sacred Lifeforce.
Sacred Lifeforce is used to add, or replace all with, a singular implicit onto an item, at the cost that you cannot further modify the implicit of said item.
This would add synthesized modifiers to PoE2.